Exercise board



FIG. 1 is a top plan view of an exercise board showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevational view thereof; and,

FIG. 6 is a side elevational view of the side opposite that shown in FIG. 5. 

The ornamental design for an exercise board, as shown and described. 